Changing Speeds - Grizzly G7944 Owner's Manual

Changing Speeds

The Model G7943/G7944 are capable of 12 dif-
ferent spindle speed RPMs. Spindle speed is
controlled by the configuration of V-belts and
pulleys located inside the belt cover on top of the
machine.
To change speeds:
1.
DISCONNECT MACHINE FROM POWER!
2.
Loosen the belt tension lock knobs (shown in
Figure 28) on both sides of the headstock, so
the motor is free to move.
Figure 28. Loosening lock knob (both sides).
3. Rotate the belt tension lever clockwise, as
shown in Figure 29, to take tension off the
V-belts.
Figure 29. Using the belt tension lever.
-28-
4.
Locate the desired speed on the speed chart
under the belt cover and move the V-belts
to the desired V-grooves on the motor, idler,
and spindle pulleys.
For Example: As indicated in the speed
chart for 540 RPM (Figure 30), a belt combi-
nation of A-1, 2-2 creates 540 RPM.
• The "A-1" refers to the belt position
between the spindle pulley and the idler
pulley.
• The "2-2" refers to the belt position between
the motor pulley and the idler pulley.
1 RPM 210
Note: Both belts may have to be removed
D 4 4
C 3 3
before certain speed changes can be made.
B 2 2
A 1 1
BELT:A-1,4-4
5 RPM 480
D 4 4
C 3 3
B 2 2
A 1 1
BELT:B-2,3-3
9 RPM 1510
D 4 4
C 3 3
B 2 2
A 1 1
Figure 30. Pulley combination for 540 RPM for
BELT:B-2.1-1
5.
Rotate the belt tension lever until the belts
are tight. Tighten both lock knobs.
6.
Close the cover before connecting the
machine to power.
Model G7943/G7944 (Mfd. Since 09/17)
2 RPM 260
D 4 4
C 3 3
B 2 2
A 1 1
BELT:B— 2,4–4
6 RPM 540
D 4 4
C 3 3
B 2 2
A 1 1
BELT:A— 1,2–2
RPM 1650
10
D 4 4
C 3 3
B 2 2
A 1 1
example.
BELT:D-4.2-2
3 RPM 32
D 4
C 3
B 2
A 1
BELT:A—1,3–3
7 RPM 98
D 4
C 3
B 2
A 1
BELT:D— 4,3–3
RPM 218
11
D 4
C 3
B 2
A 1
BELT:C-3.1-1